Socrates ... is the first philosopher of life [Lebensphilosoph], ... Thinking serves life, while among all previous philosophers life had served thought and knowledge. ... Thus Socratic philosophy is absolutely practical: it is hostile to all knowledge unconnected to ethical implications.
Philosophy ... is a science, and as such has no articles of faith; accordingly, in it nothing can be assumed as existing except what is either positively given empirically, or demonstrated through indubitable conclusions.
It is the courage to make a clean breast of it in the face of every question that makes the philosopher. He must be like Sophocles' Oedipus, who, seeking enlightenment concerning his terrible fate, pursues his indefatigable inquiry even though he divines that appalling horror awaits him in the answer. But most of us carry with us the Jocasta in our hearts, who begs Oedipus, for God's sake, not to inquire further.
Living well is an art that can be developed: a love of life and ability to take great pleasure from small offerings and assurance that the world owes you nothing and that every gift is exactly that, a gift.
Man is the cruelest animal. At tragedies, bullfights, and crucifixions he has so far felt best on earth; and when he invented hell for himself, behold, that was his very heaven.